For a circular sewer of diameter D running partially full with central angle ,

• A. <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.52-1.png">
• B. <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.52-2.png">
• C. <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.52-3.png">
• D. <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.52-4.png">
• E. all the above.